Telephone instrument.



W. P. STUNZ.

TELEPHONE INSTRUMENT. APPLICATION FILED SEPT. 29, 1910.

Patented June 25, 1912.

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wILLIA rREs'IroN'sTUNz, or 'LANsDoWNE, MARYLAND, Assmnon' Too noses r nnens'rnn WEBB, or BALTIMORE, MARYLAND. v

TnLnr oNn ms'rnuiumvir.

1,03 ,550. To alt whom it may concern: 1

Be it known that I, WILLIAM Pi Es'roN S 'rtiNz, a citizen of the United States, residing at Lansdowne, in the bounty of Baltimore and State ofMaryland, have invented certain 1- new and useful Improvements in "Telephone Instruments; and I do declare the following to be a full,'clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of refer-' ence marked thereon, which form apart of this specification. g

My invention relates totelephonic instruments, and has for its particular object to improve the quality in tone, volume and distinctne'ss of the sound waves carried'to a receiver from atransmitter or other source of origin; also to, provide a telephonicinstrument in which the diaphragm is normally under the pressure of a lever influenced by variation in an electric circuit or magnetic strain whereby the diaphragm is rendered more sensitive and is more quickly responsive to vibrations received through or imparted to the lever; also to providea telephonic instrument in which the dia- "30 phragm will be confined in place by pressure derived from a-lever normally under pressure whereby the diaphragm is ren" dered. more sensitive to vibrations, and

whereby any variation in retaining-pressure on the diaphragm due to usage, and

which in constructions heretofore employed arises from changes taking place in the diaphragm retaining means, is automatically absorbed or taken up; and it hasfurther .for its object to simplify and improve the v mechanical construction and arrangement ofthe parts by which they may be more readily assembled and taken apart.

iVhile the invention has been designed particularly for use in telephonic receivers,

and a receiver has been selected for the purpose of illustration, ya! it is to be understood toinclude in i415 scope any and all applications for'which it may be adapted.

To the--accomplishment. of the foregoing and such other objects may hereinafter appear, the invention consists in the teadistributing horn (not illustrated). plate 9 may be supported from the magnet v Specification of Letters Patent. PatntedJune 25, 1912; Application filed September 29, 1910.. Serial No. 584,570.

tures hereinafter" particularly described and then'sought. tob'e clearly defined. by the claimsmeference being had to the acc0m-" panylng drawing forming, a part hereof and in which Figure 1 is aplan view of an instrument, in this instance a receiver, embody-.

ing my invention, the top of the receiver box'lor casing being removed'fand Fig. 2

a permanent magnetfas illustrated being a well known horseshoe type, upon a pole 2 of which is mounted an induction coil 3, and upon the other poles of which is mounted an armature 5', a small air space In the drawing the numeral ldesignates 6 being formed between thepole 2 and the armature as illustrated. The armaturehas an extension or arm 7 which extends be yond the field of the magnetand COHSQltLItBS is contained within the plate or disk 9 hav- 1ng,in the receiver type illustrated, the tube; 10" to" which may be attached a sound The l by posts 11 and screws 12 with adjustingflnuts 13 and 14, or be otherwise supported. Betweenthe diaphragm 8 and its seat in the plate is .a ring 15 preferably of'soft fibrous material upon. which the diaphragm rests, The diaphragnr is held place by pressure from the arm or lever 7 which is held in'constantcontact with the diaphragm by pressure derived from the pull of the magnet on the armature, the contact being maintained in the back and forth 'movement 'or vibration of the diaphragm. For clearness of illustration, the depression in the center of the diaphragm-by the pressure exerted by the magnetic pull on the lever is somewhat magnified in the drawing. It will be, understood that the pressure may be more or less but should be such that there will be constant contact under pressure be tween the lever andthe diaphragm so that the movement of one will respond to the movement of the other, the lever in its movement in one direction movement to thediaphragm and when the pressure of the lever is lessened the diaphragm moving in the opposite direction with the lever so thatthe movement of one responds to the movement of the other. By causing the lever to constantly exert a pressure on the diaphragm the latteris rendered more sensitively responsive to the variations-in the magnetic pull due to the fluctuations in the current passing through the induction coil This feature of the invention accordingly in its broadest scope 'comprehends a diaphragm constantly under mitted through-an arm or lever. Another advantage of having the diaphragm-under the constant pressure of the arm or lever isthat the diaphragm may be held in place solely by-such pressure without the employmentof rings or clamps as commonly.

practised; This makes it possible to more quickly and easily place the diaphragm in place and remove it when necessary, and also causes the diaphragm tobe automatically adjusted upon its seat and to be held firmly thereon, so that for mechanical rea-.

sons as well as the others mentioned the lnvention possesses'much merit.

The arm or lever 7 may be of any ap-v proved form but preferably is of an elbow form as illustrated, and preferably is of steel or other metal, and is readily placed in position by introducing its long arm b'e-i tween the posts 11 and passed between the et 1, and plate 9 so that its bent'end' wil bear against the diaphragm-while it will have itsv fulcrum through thearmature 5 on the'pole 4 of the permanent magnet.

The'm'agnetism ofthe' magnet will hold the .leversecurely in .place, and as the fluctuations of the current passing through the in- 'duction coil 3 will cause variations .in the magnetic pull on the armature the lever'will quickly respond to such changes in the magnetic pull so that the pressure of the lever .on thediaphragm will correspondingly increase or lessen and the diaphragm respond to the receding movement of the lever and as quickly respond to the return movement of the lever When its pressure is increased.

A comparatively slight movement of the lever on itstfulcrum .afiorded by the pole of" the magnet will be amplified at its end in 'cont'act'with the diaphragm and the receiver will give forth clear and distinct wave vibrations. While it is not necessary that the end of the lever should be permanently or rigidly connected to the diaphragmlqeimparting cause it is kept in constant contact therewith by the magnetic pull of the magnet,

rigidly connected to thediaphragm but in such case its relation to the diaphragm should be such that it will constantly exert pressure thereon as particularly described.

I have illustrated and described with parrangement of the several parts but it will be appreciated that, changes can be made therein which will be within the scope of the invention in its broadest interpretation forth its merits whatI claim is: a l

'1. In a telephone instrument including electro-magnetic means, a diaphragm free at or lever at all times under magnetic stress for exerting a constant pressure on the diaphragm, said lever and diaphragm being responsive in their'movements one to the other. e

2'. In a telephone instrument, a diaphragm free at its periphery, a seat therefor, an arm or lever exerting pressure on the aphragm, and means ex- 3. In a telephone instrument, a diaphragm net, and means for transmitting at all times a constant pull of the magnet on the diaphragm to hold it inoperative position.

4. In a telephone instrument, adiaphragm bow lever connected with the diaphragm, and a magnet actuating the lever to exert at all times a constant magnetic stress on the lever throughwhich it is transmitted to thediaphragm.

5. In a telephone instrument, a diaphragm, and a lever resting freely upon a magnetic fulcrum and having one end in free-con tact with the diaphragm and normally un- '.der magnetic stress for pressing it against the diaphragm to hold the diaphragm in operative position by such pressure.

7 6. In a telephone instrument, a diaphragm free at its periphery, a seat for the diaerative connection with the diaphragm and ing the diaphragm in place toward its seat. In a telephone instrument, a diaphragm ticularity the preferred construction and arand accordingly I am not to be confined to v at all times a" constant 100 -.erti ng magnetic pullon, the arm or lever to lmpart' said pressure to the diaphragm-- free at its periphery, a seat therefor, a mag-' free at its periphery, a seat therefor, an elphragm, and a lever having one end in opyet it will. be understood that it may be Having described my invention and set its periphery, a seat therefor, and an arm 3 at all times under magnetic strain for holdfree at its'periphery, a seat therefor, a lever :h 0lding the diaphragm in operative position by pressure on the diaphragm, and a magnet exerting a magnetic pull on the lever at all'times to press it against the diaphragm.

8. In a telephone instrument, adiaphragm free at its periphery, a seattherefor, a lever holding thfldiaphragm in operative posiv tlOh by pressure on the diaphragm a magnet exerting a magnetic pull on the lever at all times to exert a constant pressure of STUNZ. 

